This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Distasteful and repellant: hellacious smog.

adj. Slang Extraordinary; remarkable: a hellacious catch of fish.

adj. nasty, repellent

adj. remarkable, unbelievable, unusual

"He takes us back to his youth in "hellacious" Brownsville, Brooklyn of the 1970s, telling us that before he became a street thug, he was the target of neighborhood bullies because he lacked the confidence to stand up for himself."

hellaciously   

Ignatius    audacious    capacious    ceraceous    crustaceous    efficacious    fallacious    flirtatious    gracious    herbaceous   

low-stress    once-bright    bass)-playin'    bull-fiddle    express-train    kick-ass    casar    10-minute    50ft    round-trip